28383821 has 8 divisors (see below), whose sum is σ = 28694400. Its totient is φ = 28075248.

The previous prime is 28383811. The next prime is 28383857. The reversal of 28383821 is 12838382.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28383821 - 2¹⁰ = 28382797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28383811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58040 + ... + 58526.

It is an arithmetic number, because the mean of its divisors is an integer number (3586800).

Almost surely, 2^28383821 is an apocalyptic number.

It is an amenable number.

28383821 is a deficient number, since it is larger than the sum of its proper divisors (310579).

28383821 is a wasteful number, since it uses less digits than its factorization.

28383821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003.

The product of its digits is 18432, while the sum is 35.

The square root of 28383821 is about 5327.6468539121. The cubic root of 28383821 is about 305.0401129720.

The spelling of 28383821 in words is "twenty-eight million, three hundred eighty-three thousand, eight hundred twenty-one".